Gas burner



May 2l, 1929.

A. STOCKSTROM ET AL GAS' 'BURNER 2 Sheets-Sheet l.

Filed Aug. so, 1926 May 2l, 1929. A. sTocKsTRoM ET AL 1,714,409 l GAS BURNER 2 Sheets-Sheet 2 Filed Aug. 30, 1926 Patented May 21, 1929.

UNITED STATES 1,714,409y lPATENT OFFICE.

ARTHUR s'rocxsTRoM AND ISAAC VERNON R'RUMBAUGH, or Sr. LOUIS, MISSOURI,

ASsIGNoRs To AMERICAN s'rovE COMPANY, or sr. LOUIS, MISSOURI, A coRPoRA- TION' OF NEW JERSEY.

GAS BURNER.

Application filed -August 30, 1926. Serial No. 132,534.

This invention relates to certain improvements in gas burners whereby the following 'objects and purposes are attained.

The primary purpose of the present invention is to combine an outer cast iron melnber with an inner member consisting of an alloy enabling the inner member to be die cast for the purpose hereinafter set forth.

The purpose of the present invention is to make the outer member of cast iron and the inner member of aluminum alloy, thus enabling the inner member to be die cast.

We were therefore confronted withthe manufacturing problem of the production of a burner constructed in the manner hereinafter described.

In order to make the inner member of the form herein disclosed we have found it to be necessary to die cast it instead of the usual mold casting, and therefore it must be composed of a metal that is readily capable of' being die cast. We also found that a metal that is capable of being .diecast has a melting point below that of the gas flame, whereas the outer member of the burner is constructed of cast iron which has a melting point above that caused by the burning gas.

Therefore the problem to be solvedwas to so construct this aluminum alloy and to so connect'it with the cast'iron outer member that when in operation it would bekept at a temperature below its melting point, for

otherwise it would be quickly destroyed.

We also found that when the innermember 'is die cast, it does away ywith machines and the labor for cutting the parts thereof, thus greatly decreasing its cost of production over Athe ordinary method of mold casting, and it further produces a non-corrodible member withl its inherent advantages.

Other objects of the invention will be understood from the followin description.` i

In the accompanying rawings: Y Figure 1 is a top plan view of our improved 45 burnenfv Figure 2 is a central vertical section of the burner, a cookin utensilbeing shown in dottedlines therel ve.

Figure 3 is an enlarged side part carryln tached. .1.

Figure 4 is an inverted enlarged planvlew vs howm a art of the interior,non-corrosive` 4metal t at 1s provided ,with the gas ports.

elevationofithe 5o g the ports, the same''beingdeg It isf-well known to those skilled m thls art,105

Figure 5 is al vertical central section of the 55 i improved burner showing a slight modification 1n its construction. l

Figure 6 is a top plan view of Figure 5.

Our improved burner comprises essentially two parts, the interior member 1 and the ex- 60 terror member 2, the latter having projecting therefrom the manifold 3. This -manifold l may extend in any desired direction without affect-ing the present improvement, though for convenience it is shown in the drawing as extended horizontally.

The member or part 2 is comprised of cast iron, while the interior part l is made of a non-corrodible material. This interior part 1 is annular in shape, thereby-providing a 70 vertical passage 4 through which passes the secondary air for supporting combustion. The primary air'passes through the manifold 3 and the part 2 and is mixed with the gas as is well understood lby those skilled in the art. i Attention is particularly called to the fact that the non-corrodible interior member 1 is provided with' exterior teeth 5 that are radially disposed in respectto the axis of the Said member. These teeth 5 form, of course, 80 spaces 6 between them, and the teeth extend outwardly and upwardly at an angle and engage tightly a correspondin ly inclined annular portion 7 formed on t e exterior cast iron member 2. In this manner a plurality ofl ports are formed by the spaces 6, and these ports extend outwardly at an angle to the burner.

The inner wall of the interior member 1 1s provided with a plurality of pro]ect1ons 8, 90 through which projections ports 9 are formed, thesaid ports extending upwardly and inwardly at an angle to the ports. The interior member 1 is made separate from the interior meinber 2, and is provided with a downward- 95 ly extended portion 4, the lower end of the extended portion provided with exterior threads 10 that engage4 exterior threads 11 formed in the bottom 12 of the exteripr member 2. It will be seen that in this manner the p `interior member is made annular in form and that the passage i has its lower endl openforthe passage of secondary air to the as ports 9.

lthat where a burner has its ports ni'ade in cast iron, that the ports become corroded and to a certain extent partially closed, and that the izo below its melting point.

partially closing of these ports reduces the speed of the gas through the burner and thereby reduces the amount of air drawn into the manifold 3 by its passage therethrough. To the extent that the ports are partially obstructed by corrosion, thc amount of air fed with the gas is correspondingly reduced and that the gas is therefore not provided with the proper quantity of air for its complete comlmstioii, with the result that there is formed carbon monoxide. It is well understood also that carbon monoxide gas is very objectionable and if in sutlicient quantities, is extremely dangerous. I

This interior 'portion l is composed ot an aluminum alloy that has a melting point of 1075o F. It is well known that the temperature of a gas flame is over 2000o F. It is tlie'refore nefessaryto provide means for keeping the temperature of this interior non-corrodible allov below its melting point. For this reason the burner is made relatively deep, which provides suliicientY length for the passage of the secondary air therethrough to cause it to keep the temperature of the alloy considerably through it of course cools it, and the member is further coole'd by reason of the intimate contact of its screw threaded lower end with the exterior member 2 through which the incoming mixed gas and air flow. The gas being relatively cool, strikes the member 1 in addition to the effect of the secondary air, and we find that this alloy member is kept at a temperature considerably below its melting point.

Further this alloy member is screwed down to bring the teeth 5 in intimate contact with the cast iron member 2 and also form a gas tight relation with the inclined member 7 of the part 2.

For the purpose of reducing the cost of the burner and avoiding the necessity of machine work in it, the non-corrodible alloy interior member 1 is die cast so that machine work on it is vunnecessary and the same fits snugly the inclined part 7 when it is in position. To form this interior part l with machinery would be quite a complicated job, calling for the expert labor and also calling for machines adapted to perform the work. By die casting it, all the machine and expert labor is done away with, .making .the construction much cheaper than it would be otherwise.

The object of the interior ports 9 is to cause the flame to strike the center of the utensil 14, and spread outwardl while the exterior ports or passageways ow outwardly and cover the outer portionof the utensil. Attention is directed to the fact that the outlet ends of the passages 5 and 9 respectively are located quite a distance apart for the purpose of causing the llames from the two passages from merging immediately at thebottom of the utensil 14, and for the purpose of caus- The air passing' ing the fuel from the passages 9 to flow first to the center of the utensil. It will also be noted that the member 4 is composed of relatively thiu'metal and in order to elongate the passages 9 so that the fuel flowing therefrom will be directed inwardly at a sufiii'ient angle to reach the bottom of the utensil 14, the inner wall of the iuember 4 is provided with the projections 8, thereby elongating the passages 9 and accomplishing the above function. The iame from the interior ports 9 necessarily striking the center of the utensil, flows outward and min gles with the outwardly flowing tiame from the passages and the ports 6, thereby completely covering the whole bottom surf face of the utensil.` This construction absolutely avoids having a cooling center in the utensil as is the casevwith the ordinary gas burner.

In Figure 2 our burner isshown fullsize from' which it will be noted that it is much smaller than the ordinary gas burner which makes it liigbtly eiicient for cooking opera tions because of its relatively smaller diameter that causes the flame to engage the complete bottom of the utensil, striking the utensil in the center and then spread over-the whole of its surface. flame has a longer period of contact with the utensil than is ordinarily effected by the prior constructionsv of gas burners. i w By reason of the combination of the outwardly inclined passages 6 and the inwardly inclined passages 9 the fuel and flames from. the said passages play upon the bottom of the utensil 14 very differently from what it would be were the outlet passages 9 combined with vertically arranged passages. Where the burner is provided with vertically arranged passages adjacent the outlets of the passages 9, the fuel and flames spread in both direc- By reason of this fact the' tions, that is they spread inward toward the l center of the utensil and spread outward, and the flame from the vertical passages would commingle with the llame from the passages 9. This conditionl is dilerent from the construction here shown to an exaggerated extent when a lurality of vertical passages is provided, t ereby providing a superabundance of fuel .and llames which spread over the lwhole bottom of the utensil, Virrespective of, the action of the inwardly extending passages 9. It in e'ect destroys the action of the inwardly extending passages 9, making them wholly unnecessary. lTherefore the specific' construction here shown being the combination of inwardly extending passages in the inner member and outwardly extending passages in theY outer member, the outlets of the two passages'being removed, makes a burner that operates very dilerently and is very different from a combination of inwardly extending passages and vertical passageways located adjacent each other in the manner shown inthe'patent to Kahn and Longfellow,

iso

Atu

` A 'L No. 769,389, September 6, 1904. It also enables a much smaller burner to be used just as l eiciently as the much larger burner shown inthe said patent. The burner here shown isof a diameter that does not exceed the diameter of the first vertical row of openings, while thc patentshows tfour additional vertical openings. This is due to the fact that the inner openings extend inwardly at anlangle and cause the fuel and flame to spread o 'nly inwardly, whereas the flame from the vertical openings vspreads in both directions.

We therefore believe our burner to be a new type of gas burner which has a novel function, as we have herein set forth.

In Figures 5 and 6 a slight modification in the construction is shown. This modification consists in providing the interiormember 1 with itfs inner wall formed in an outward curve as shown, and member 2 havingits upper portion inclined outwardly as shown at 2', the members otherwise being substantially i the same construction as herein explained. Itv

'will also be noted that in the modification the upper ends ofthe passages are shown slightly open and the gas will 'How more directly upward than will be the case with the construction shown inFigures 1 to 4 inclusive.

The inner member 1 is composed of an aluminum alloy. This alloy is readily 'adapted to make a good clean die cast-ing.

We desire it understood fand changes may be made in the construction vherein shown and described Without departing from the spirit andscope of our invention, so long as said changes in construction are that modifications' l-within a fair interpretation of the appended claim.

Havin thus described our invention, what is desire, to claim land secure by Letters Patent is:

A gas burner of the type herein described.,`

wardly and the under side of said extension provided with' depending teeth in engagement with the said outwardly extending porextending. wall of smaller diameter than sai outer mem' "ber, the upper end of said wall extending outtion of the said outer cast-iron member, there- -by forming outwardly extending gas-passages and the outwardly extending portion of the inner member also providedwith outwardly extending gas-openings, said inner alloy member having a melting point normally below that of the burning gas, the lower end of the inner member in tight Contact with the said outer member, whereby the-inner member is cooled by heat conduction of the cast-iron member and maintained at a temperature'below its melting oint by said contact, by air flowiai throng the inner member, and by mixe air and gas striking the v`outer side of the inner member,

substantially as described.

-Intestimony whereof we hereunto aix our signatures. 

